The Protostar is what we consider to newly-forming star to be when it is in stages four and five. A solar-mass star typically lasts about 100,000 years as a protostar.
The video is about protostar V1647 Orionis; we derive information about it from its emission.
Protostars develop into main sequence stars with the formation of a T Tauri Star, found near molecular clouds.
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